Scapular muscle and ligaments
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| Serratus anterior origin | Lateral parts of the 1th-8th ribs
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| Serratus anterior insertion | Anterior surface of medial border of scapula
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| Serratus anterior innervation | long thoracic nerve
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| Serratus anterior action | 1. protracts scapula
2. holds scapula against the thoracic wall
3. superior rotation of the scapula
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| Deltoid origin | lateral third of clavicle, acromion process, and spine of scapula
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| Deltoid insertion | deltoid tuberosity
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| Deltoid innervation | axillary nerve
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| Deltoid Action | 1. All three simultaneously: abduct the humerus after 15 degrees to the horizontal and stabilize the shoulder
2. Anterior: flexion and medial rotation of the humerus
3. Posterior: extension and lateral rotates the humerus
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| Teres Major origin | inferior angle of scapula (posterior surface)
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| Teres major insertion | medial lip of intertubercular sulcus
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| Teres major innervation | lower subscapular nerve
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| Teres major action | adducts and medially rotates the humerus
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| Name the rotator cuff muscles | "SITS" Supraspinatus, Infrapinatous, Teres minor, Subscapularis
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| Supraspinatus origin | Supraspinous fossa
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| Supraspinatus insertion | superior aspect of greater tubercle
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| Supraspinatus innervation | suprascapular nerve
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| Supraspinatus action | 1. Abduct the arm for the first 15 degrees
2. Tonic contraction stabilizes the glenohumeral joint
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| Infraspinatus origin | Infraspinous fossa
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| Infraspinatus insertion | middle aspect of the greater tubercle
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| infraspinatus innervation | suprascapular nerve
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| infraspinatous action | 1. tonic contraction stabilizes the glenohumeral joint
2. laterally rotates arm
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| teres minor origin | middle part of lateral border of scapula
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| teres minor insertion | inferior aspect of greater tubercle
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| teres minor innervation | axillary nerve
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| teres minor action | 1. tonic contraction stabilizes the glenohumeral joint
2. laterally rotates the arm
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| subscapularis origin | subscapular fossa
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| subscapularis insertion | lesser tubercle
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| subscapularis innervation | upper and lower subscapular nerves
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| subscapularis action | 1. tonic contaction stabilizes glenohumeral joint
2. medially rotates arm
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